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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff4968910a4e3bdf683fbd6e790548a2f5595f1bc5e15dcb5efaf25864dddc9c' 
  AND token = 'RZqPp5Q41uPPXapNpfFxRepx7Ho3Iqa7nSw74ZWGWIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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