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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aa31c01ad3959ec70ce62981bfd0a1b04dca1faad145951d07a4e7085b694dd' 
  AND token = 'A3s+WrrjwfqcMRwDl+FCkc6KI2Cx4mSPnObUa0y/phM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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