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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c806af97f570af85af3efbb0041b46826c1a411fb8430e17a698ca8784bfc3e6' 
  AND token = 'snrTswOPDA3o+jxzRmDuGxeK8zRlaI5TYLlC1SasX6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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