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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c84606ebbe5d3baa9c5c69acbac08c064f5f6fdf184fd203bfd29a6bbc0f3022' 
  AND token = 'FsdUopTUV8LPovnCe1MqzLL3RnFT3zsUocS51dCECdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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