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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6432dfbee1a3c690b77b5acea90562452ffb28fcc195c5f33c62c1a4e380bfd2' 
  AND token = 'e0CpLX0Dczq8LT72gxkOvqYSbg/etoXgxlqNLkL9VU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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