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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d42a5518665115959a8336df1263cfc0b912adaa352b03ef7b3e4be5d1cc6d5' 
  AND token = 'NyidMPloY/7xsiJzkEbzs8Cp+zlTul6loJozaldiDxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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