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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8b495939fe26f4b9971073395f4318408ba436760c8aea69859fc86cbbe2a79' 
  AND token = 'Lwk1z06xP+/Q/HNouYDd+qRT1Se06KPg9ebzt/z2NMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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