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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a2dcb675c26d2ecc823acdb0d4df8a991287049e4c0d47fb072b943c62a7905' 
  AND token = 'oTPw6GBF590YLvHUU3wguIR/2Pk/n7bYLQQOODDdn38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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