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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8d45ee971777fdc8a277ac2c3b2b4ddf344ce29efcd6cd82eb2e1dc77a979e2' 
  AND token = '92ihRVdSH90EZyDG9UVCxyJSrvZFY17hlt5e2QNvw5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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