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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26212a0148a2ea27420c969ebb7f8295682066923901f499ee2c4595361e7693' 
  AND token = 'REYfneKddcNYzZW1SjcisqxsYqxql8/NKHfaw+KKusg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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