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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4ee3eed4337e835f1b95ea7c6ee4cd7844442233697084de05d8f8dd3ad9a02' 
  AND token = 'gAP/ObO9oOveMhQEs88+fDtYqleJm5YpdIrh0jdbCKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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