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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55bdd07f9f9672b20f15988f4a51b77170d7ec92a8de18444e6065f0b964b52a' 
  AND token = 'fo9b/zg4N3Ft8dOB8gQ0Pmo++KDam3+OEabtnWELoQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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