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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f9cf5b14418f144e3334dfad60beb5ef4c63136ef8636613965c80d522cd43f' 
  AND token = 'rU/tSkHsoOws1cxxKNMCpFNyGRw4cf7sS34T7h4D3Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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