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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a7adf06f539eb8439697f10e332b0c6bd5f0c361b2b67fe8f83d693f3e4a94e' 
  AND token = 'QNdItbXB4i60vdasXEa2UM2jXFIC9VrzLwpfkrOhXT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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