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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38d113010e282a840a190776f5c1ab016d647f76de3dab451c8a1a052bca2e5d' 
  AND token = 'qD0jjBU5kjNcnmP1mSJXlgF+IlfWdhIKhs7D78OlPKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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