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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f66fcc83d668974025508d58edf184e1cc3cf6966ba8cb36636ec4656790f194' 
  AND token = 'k9hOaXLAB5F3278v2kawUCXefdr0+65/6IS+Ob1IvPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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