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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bf3dd49a942dbb940a4b075e6f54bf7f5d17b1ff963d67b5f4a21b73ce31fa6' 
  AND token = 'rH4odhb/5K+Y60lVli9m5sCph9SNWVez0d58+x4YiBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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