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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4da2a0276269ed2c433e9bb13ae15eff04e287f63b4e0e86a8e926eee6e9da5' 
  AND token = '4IWQnT/t1Zh3g/Hh+JywyfmC9x/prl2Fs0goeIREaJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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