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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b71adb30c85ed8efd655505846fc82a773d1fc3f5603326c0d5df15368dd683e' 
  AND token = '0eagkhsN3c3WbUmLtwlo7lyIR7QDDRqQN0QnI97Y3Yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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