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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bed1bba2e6b8fdd59d5d2b82986930dee3a77222bc3cf73e11c3b0cd234158a9' 
  AND token = 'VMh/mUlITSPC4ZUA0e+cp/hsFEgRtw4nD7HuJ+CLkAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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