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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32736ecaee7bd1ab67ec35f4f62e14fd44f30cb47d2986e53aa26d3bfdb6c9f5' 
  AND token = 'Sfwy9moKQM+egAL9JCNehs9EHF4dUJ9scdXu6du6lqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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