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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe32585281cd03b908d69edcd229c6db691ef0fdd5ee3d47eadd84309d913c2d' 
  AND token = 'gfeAAWDG3v4SQ/z/Cxw2f4t1AAYA2jUEnrL8SmiQKEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}