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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef318c44554535a6e93faea7333bb0c37eb1e7bf7c7d06af1243bed91f46ad2e' 
  AND token = 'GE5OBwJFK3c7EFy4SspK66x0BZfR73p+19ZTTSB+dwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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