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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f1f6dee536ee472ffd97d1a2e7ab039fa9a967ff85382a10d2215044b478db5' 
  AND token = '5kZpbj3kiB5uOfXMnqyoXbz0mr/3RudScuq5+n3Ok/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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