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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f935619ba3f23f6e5f6dac992b8008c73402db563b787f0eaba466ebf6d14f' 
  AND token = 'pdwC1DzRR2UEVE/zzDm9ImHJZYmm69ciY00mi5IjBAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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