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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9be1ac0a8f5db4ce9761744f42fb2bbf1e57398209abac47f0ad9a71f8b5938' 
  AND token = 'npg0fEJKN63dGqdNu1bFrUtbNmnJHA+GvG5BbtYjU+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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