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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a59b61ee2df8e6982f072ec3e4c02d3d60835c3b22c3188584bb8b3ed044b1fd' 
  AND token = 'foMMObHU8lek3+Tyzuk9M65fki86njV6ImstJcparOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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