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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e336802dada87f1e559ff2396057db580ff32eeaf9b98e8e6aa181c8858f702e' 
  AND token = 'VpVmSlUkP9yM3UHTCE+4Kgqq6e+/wC3KC9kXqd8B7qA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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