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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffcb0553504505e2116b2781e1293a4b9a5b98907d6b2bcc4b84e709273ab46f' 
  AND token = '0jpU8R/srPw5BY4ops0i8o/jaVp6o0peNyLPUbg1jOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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