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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e92e634c0dd694abf299a338d5c25175d9ff84e218f9979d506338ce6824b74' 
  AND token = 'wcvN6aQOKp+rXyCiSD1/dt1+qTwtRDSXPbSfO6l4Or8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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