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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea377f669e286264515900e0f83ce7f02575c824a04f73d3a84c425e70d5065' 
  AND token = '1uFAz4685KX8qlSTXmqQN21mVBqVp59q4cAcRMod/P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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