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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd830c4a5b187d7907fb0744e8005056bb1ef585c88afef16750c7e5d5df48f3b' 
  AND token = 'BHBh0U9XeZeSuRigrhXVTdzDeLg60O7v5m3IkFH/moM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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