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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b3add35d1a09639de306ac09da2c1a904f21a8f604a3b669e4c7f928406899f' 
  AND token = '9Ob9pk1oGFhbMEoRgWKpb4VmX2YZ0eLJ0RptzFAwsPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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