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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86c4891363c0f8f5baa9f895ef7d9473b31e813a2ef9aa63f90c237133a820fb' 
  AND token = 'k4c6rsYZeKEtno9YrWceVpbyys+9GM/UIPA7/mc6YKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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