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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05adde20e426273e150757dda4e9ea2e7f69c146a89ce36d84548c864aa7169d' 
  AND token = 'RVhfvbsneo0HQKI0hm5M3CYjt0e75Ac7XZH3aQNXSOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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