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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d2cf042cb8b21087ad36b23e3a878bfb6b4756c076869c97cb81d8a5becd500' 
  AND token = 'nB0vmxvF69Z4rhcefcyQy78Rx11iVmxLUwzbiFwxHIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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