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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59eca7435132d86d6f0ba61588800da1ac0e8229f0dd84553f55ee2c356a7909' 
  AND token = 'O8dv3gHrIV88C7sg2gX+L5p/6JKin+r3wK3yWyXHGFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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