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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '941baed90877b1bf7c6dcc2d1b4d0b249d250a4dddca5d9643aa33ed76b32c15' 
  AND token = 'bY2jY5vk3OcIDXTdn9xf76+jsHurz8aiPOJ9id2X//o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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