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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eca796dc9b4c0d98b1ba6e398ddbcc912150d5c674a2bac338cc8c1b10a6afb1' 
  AND token = 'prI/wmbjZTvrhgtVbKcuvT6NC4LjZaf+bMXRBbirt2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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