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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf566bb530d86c6caa26a1dbe324157030e68ce31a3e36535ac44d308daa883a' 
  AND token = 'IccUGAB1g9z2OuZI7dvF5ZO64WiJdUi0ozJihdlJM+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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