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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aff93a0d0378ec14975fac49a1078c305220470ea7e0073868943944560690e' 
  AND token = 'UpRE9jitgmMq93QynUuSIKq+FwjRsa/8LTREBlS6hmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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