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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa36ed79e70a20f127ccb86013c86ee46923e5da742e65947b83d79463759178' 
  AND token = 'cuiuXu2yzN2AnlrKVpUWesMP8ptdBsRakDfK7etQu50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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