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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c08280b1c5887a5af82a787e509af41c65b91892e2c7a5ed9a0e104245a02e3b' 
  AND token = 'gny7/MUUSxJOEn8eiUUL7gOOojATKrLl5b075Fbd5Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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