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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '266cfe7524519f57fc9795f7068b21c2b3d1b67c35dd08c1c8707539dbea42d1' 
  AND token = '4BBdzkNBKe8fqQQWdAsOreW3CUx29TBuiwtN4Xfn590=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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