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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38baf348dd2765a6ac0eca67f3f83e0fdd00d6585cbf1b33f604de46190b8a43' 
  AND token = 'EW5qM09GUXf7ayRd1fSCG+lGSvuBQ0y+1lqqG1QEQBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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