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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd51db01cc5331513e5008c8e849fc9c9a1fa2fb2e3fca413005e3d848f3923c2' 
  AND token = 'yINVOTodcyeD9nStO5vHczf1HTw5e1BW4TO0OUUKrIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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