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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36b0e0d631322e12b41665e7fa9d90b6cca77ee6511083436bc55d0a1dff015d' 
  AND token = 'cr/f+mR1f+IVBHXW0AKxm62okJdxMbrcAf88fVnIp6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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